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Transportation NOx emissions in the United States 1990-2019

Over the past three decades nitrogen oxide emissions in the United States have decreased significantly. By 2019 they had fallen to 4.9 million tons. In the United States, the U.S. Clean Air Act aims to improve air quality by limiting the production of nitric oxide and nitrogen dioxide, collectively referred to as NOx. Nitrogen oxide is one of main causes of air pollution related deaths worldwide and is produced by the combustion of fossil fuels.

Transportation sector nitrogen oxide (NOx) emissions in the United States from 1990 to 2019

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Release date

May 2020


United States

Survey time period

1990 to 2019

Supplementary notes

*The source states "the emissions model used for mobile sources changed from MOBILE6.2 to MOVES 2010 in December 2009. This change included a notable increase in NOx emissions. The EPA adjusted data back to 2002 to reflect the change in models. The higher emissions in 2002 are because of this method change and not because of real increases in NOx emissions from mobile sources"

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Statistics on "Transportation emissions in the United States"

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